Improvement in hoisting-machines



J. SCOTT. l HOISTING Mmmm.'

N0.112,855. Patented Mar. 21, 1871.

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UNITED STATES PATENT OFFICE.

JOHN soo-Tfr, or roNTrAd'Mi-cnicnn.

IMPROVEMENT lN HOISTING-MC'HINES.

Speelde-ation forming part of Letters Patent No. 112,555, dated March 21,1871.

To all whom it may concern.'

Be it known that I, JOHN SCOTT, 0f Iontiac, in the county of Oakland and State of Michigan, have invented a new and useful Improvement in Hoisting-Machines; and I do' declare that the following is a true'and accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon, and being a part of this specification, .in which- Figure l is a side elevation of my device,

partly in section, on the linex x in Fig. 2.

Fig. 2 is a plan of the same, partly in section, onthe line y y in Fig. 1. Fig. 3 is a side elevation', showing adjustment of said device for the conveyance of materials to and from an upper story of a building. Fig. lis part of an elevation and section, z z, in Fig. 3.

, Like letters refer to like parts in each iignrc.

The natureof this invention relates'to the construction of a' simple, but very effective, machine, by means' of which bricks, mortar, and other material required by builders may be readily and economically conveyed to them, and by means of which they, themselves,with their laborers, may be raised to, and lowered from, their work with safety.

' The invention consists in the combination of a reversing gear and drum, driveu'by any convenient power, with a rope, or its equiva! lent, so connected with blocks or sheavesas to lead said rope to and from said drum to a pair of platforms, cha-irs, or boxes attached to said rope, and so combined with rollers and' guides as to enable said platforms to move inf opposite directions relatively to each other,

so that, while one of said platforms shall be compelled to ascend to the upper stories -of a buildin g with material, theother platform will descend to the lower storyto receive a freshload.

In the'accompanying drawing, Aare walls, partly erected.` of a building; and B are joistsl in the vsame. C is the reversinglever'employedto shift the clutch D, whicl is fettered as usual, and revolves with the shaft E and drum F. G is a bevel-wheel secured to the driving-shaft II, and meshes into the wheels I J, which lit loosely on the shaft E. -K is a frame provided with guides and sheaves, and of sufficient strength to carry safely the load to be elevated or lowered on the platforms L, which are attachedeto the rope M, which runs on the sheave. N and rollers 0, .the length f said ropebeing regulated by the latter, while' its position relative to the center of gravity of the platforms is maintained by the former. P are guides forming vertical tracksfo'r the rollers Q in each platform, and thus steady and direct the course of said platforms.

In adjusting the device for operation, said rope is coiled at the middle of its length around said drum a sufficient number of times to attain proper adhesion, and is thence passed 'hnder the sheaves R and overv the sheaves S, after which it is attached to said chairs, as hereinhefore described.

The working length of said rope should be such as to' allow one of said chairs to rest on the ground belowlwhile its mate is at the-landing above.v

Suppose the upper platform to be empty, and the lower one loaded and ready to be hoisted, the latch S being drawn froinits notch in the edge of the platform, and the wheels G, I, and J turning constantly in the direction-of the arrows in Fig. 2, it will suflice-to shift the clutch into either-of the wheels I J, or outof both, to reverse the course of said rope, or to stop@ it altogether. Thus, by shifting the clutch into the wheel I, the empty 4platform will descend, and the loaded one ascend, until it reaches its landing, which is indicated by the latch T- dropping into its notch and securing its platform, when the -clutch is thrown out of gear by the operator, and the platforms 'rest until ready for another'trip; then the clutch is thrown into enga-gement with the wheel J, and the course .of the platforms -is reversed.

To reach another story higher, the frame is. raised to the next tloor,and there fastened to the joists, as before, additional sections'of guides being inserted into the'breach left open by'the ascension of saidframe, and

vtightenedby wedges U to braces V and base of said frame, as shown in Fig. 3', after which the rope is adjusted, andthel device isagain ready for operation;

What I claim. as my invention, anddesire to secure by Letters'Patent, is'

The combination of the driving nd reversin'g gear D E G' II I J, drum ,rope M, sheaves R S N, rollers O Q, guides P, platforms or chairs L, frame K, and latches. T,

when arranged substantially as and /for t-he purposes set forth.

- JOHN SOQTT.- Witnesses:

l Trios. S. SPRAGUE,

H. F. EBERTS. 

